On rare occasions, a tooth that has previously had a root canal may become reinfected. When that happens, our dentists and team can help. If a tooth that has had a root canal in the past has developed problems, call Drexel Hill Smiles at 610-200-9200. Dr. Dhaval Shah, Dr. Riya Sabu, or Dr. Saloni Mansurican see you for a root canal retreatment in Drexel Hill, Pennsylvania.